NEW DESIGN MARCH 2022 (includes thinner bottom mesh to prevent artemia or thinner black worms to pass through, and leaving enough for water to easily pass. New improved material more resistance to falls, lids are more tight for better seal of the humid air and preventing black-worms to pass) Worm Box WormBox BlackWormBox Black Worms Box Worm container Keeper Worm Keeper Box with Lid Stackable ( Blackworms ) 300 Micron Mesh (NEW VERSION NOW 200 MICRONS) Washable Durable and Safe The WormKeeper was designed for keep Blackworms fresh and easy to use. Each Worm Keeper will hold up to 1 pound of Blackworms for short period of time not recommended for more and optimum for 8oz for long period. Simply place your worms in the screened insert tray. Fill the bottom container just enough so that your worms are submerged in 1/4" of water. To rinse, just pour water and it's all set.